Respiration mask



FIG. 1 is a side elevational view of a respiration mask showing my new design,

FIG. 2 is a front plan view of the respiration mask of FIG. 1, and

FIG. 3 is a back plan view of the respiration mask of FIGS. 1 and 2. 

The ornamental design for a respiration mask, as shown and described. 